"字符串拼接: ."
let g:animal_name = 'dark'
let g:cat_statement = g:animal_name . ' is a cat'

"在单引号字符串中使用单引号,使用两个单引号'' "
let teststring = 'I''m a man'

"单引号中为字符串, 双引号中可以有非字面量字符"
let single_string = 'dir is $MYVIMRC'
" 非字面量字符"???
let dual_string = "dir is $MYVIMRC"

echo 'g:animal_name : ' . g:animal_name
echo 'g:cat_statement : ' . g:cat_statement

echo 'g:teststring : ' . g:teststring

echo 'g:single_string : ' . g:single_string
echo 'g:dual_string : ' . g:dual_string